9 year age gap between kids

Hello, I am really curious if anyone else has had an age gap like this between kids? My daughter will be 9 by the time our baby is born. She was always excited to have a sibling but now realizes that the baby will be too young to be a playmate. I think she'll be disappointed and probably a little jealous when new baby comes. I know she'll be a good helper but I feel like she might get burnt out on that quickly. Any advice for me in this situation? I worry that my oldest will really struggle with this transition and become a bit resentful.   I figured out today that I'll have one potty training while the other is going through puberty. Suddenly I'm overwhelmed!